Robin Williams' family only learned the truth about his brave battle with depression and anxiety after his death. The actor had been living with undetected Lewy body dementia before tragically taking his own life in September 2014.
The condition is often misdiagnosed as Alzheimer's or Parkinson's disease, which is sadly what happened in the much-loved actor's case.
Robin had been wrongly diagnosed with Parkinson's months prior to his suicide and it wasn't until the autopsy that widow Susan Schneider Williams learned her husband was actually suffering from a separate condition. "My husband had unknowingly been battling a deadly disease," revealed Susan. "Nearly every region of his brain was under attack.